Fix the flake8 warning.
Fix the flake8 warning.

getnikola/plugins,lotabout/plugins,lotabout/plugins,lotabout/plugins,s2hc-johan/plugins,pluser/nikola_plugins,s2hc-johan/plugins,s2hc-johan/plugins,pluser/nikola_plugins,getnikola/plugins,getnikola/plugins,pluser/nikola_plugins